diff --git a/lib/sqlite3.js b/lib/sqlite3.js
new file mode 100644
index 0000000..f100b9a
--- /dev/null
+++ b/lib/sqlite3.js
@@ -0,0 +1,123 @@
+'use strict';
+
+const winston = require.main.require('winston');
+const nconf = require.main.require('nconf');
+
+const database = require.main.require('./src/database');
+const pubsub = require.main.require('./src/pubsub');
+
+async function initDB() {
+  const { db } = database;
+  db.exec(`
+  CREATE VIRTUAL TABLE IF NOT EXISTS "searchtopic" USING fts5(
+    "content", 
+    "uid" UNINDEXED,
+    "cid" UNINDEXED)`);
+  db.exec(`
+  CREATE VIRTUAL TABLE IF NOT EXISTS "searchpost" USING fts5(
+    "content", 
+    "uid" UNINDEXED,
+    "cid" UNINDEXED)`);
+}
+
+async function handleError(err) {
+	if (err && /no such table/i.test(err.message)) {
+		winston.warn('dbsearch was not initialized');
+		await initDB();
+		return;
+	}
+	throw err;
+}
+
+exports.createIndices = async function (language) {
+	if (nconf.get('isPrimary') && !nconf.get('jobsDisabled')) {
+		await initDB();
+	}
+};
+
+exports.changeIndexLanguage = async function (language) {
+	pubsub.publish('dbsearch-language-changed', language);
+};
+
+exports.searchIndex = async function (key, data, ids) {
+  const { db } = database;
+	if (!ids.length) {
+		return;
+	}
+
+	ids = ids.map(id => parseInt(id, 10));
+	try {
+    const upsert = db.prepare(`
+    REPLACE INTO "search${key}" ("rowid", "content", "uid", "cid")      
+    VALUES (@id, @content, @uid, @cid)`);
+    for (const [ i, id ] of ids.entries()) {
+      const { content, uid, cid } = data[i];
+      upsert.run({ id, content, uid, cid });
+    }
+	} catch (err) {
+		winston.error(`Error indexing ${err.stack}`);
+		await handleError(err);
+    await exports.searchIndex(key, data, ids);
+	}
+};
+
+exports.search = async function (key, data, limit) {
+  const { db } = database;
+  const { content, matchWords, uid, cid } = data;
+  if (!content) {
+    return [];
+  }
+  const query = parseQuery(content, matchWords);
+  const [ params, uidList ] = listParams({ query, limit }, uid, 'uid');
+  const [ , cidList ] = listParams(params, cid, 'cid');
+  const conditions = [ `"content" MATCH @query` ];
+  if (uidList.length > 0) {
+    conditions.push(`uid IN (${uidList})`);
+  }
+  if (cidList.length > 0) {
+    conditions.push(`cid IN (${cidList})`);
+  }
+  try {    
+    const rows = db.prepare(`
+    SELECT rowid FROM "search${key}" 
+    WHERE ${conditions.join(' AND ')}
+    LIMIT @limit`).all(params);
+		return rows.map(r => r.rowid);
+	} catch (err) {
+    await handleError(err);
+		return [];
+	}
+};
+
+exports.searchRemove = async function (key, ids) {
+  const { db } = database;
+	if (!key || !ids.length) {
+		return;
+	}
+  const [ params, idList ] = listParams({}, ids);
+	try {
+    db.prepare(`
+    DELETE FROM "search${key}"
+    WHERE "rowid" IN (${idList})`).run(params);
+	} catch (err) {
+		await handleError(err);
+	}
+};
+
+function listParams(params, keys, prefix) {
+	const keyList = [];
+  if (Array.isArray(keys)) {
+    for (const [ i, k ] of keys.entries()) {
+      const name = prefix + i;
+      params[name] = parseInt(k);
+      keyList.push(`@${name}`);
+    }
+  }
+	return [params, keyList];
+}
+
+function parseQuery(content, matchWords) {
+  const words = content.trim().split(/\s+/);
+  const sep = (matchWords === 'any') ? ' OR ' : ' ';
+  return words.join(sep);
+}